Re: [dpdk-dev] [PATCH v2 1/3] security: add SA config option for inner pkt csum

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> Add inner packet IPv4 hdr and L4 checksum enable options
> in conf. These will be used in case of protocol offload.
> Per SA, application could specify whether the
> checksum(compute/verify) can be offloaded to security device.
> 
> Signed-off-by: Archana Muniganti <marchana@marvell.com>
> ---
>  doc/guides/cryptodevs/features/default.ini |  1 +
>  doc/guides/rel_notes/deprecation.rst       |  4 ++--
>  doc/guides/rel_notes/release_21_11.rst     |  4 ++++
>  lib/cryptodev/rte_cryptodev.h              |  2 ++
>  lib/security/rte_security.h                | 18 ++++++++++++++++++
>  5 files changed, 27 insertions(+), 2 deletions(-)
> 
> diff --git a/doc/guides/cryptodevs/features/default.ini b/doc/guides/cryptodevs/features/default.ini
> index c24814de98..96d95ddc81 100644
> --- a/doc/guides/cryptodevs/features/default.ini
> +++ b/doc/guides/cryptodevs/features/default.ini
> @@ -33,6 +33,7 @@ Non-Byte aligned data  =
>  Sym raw data path API  =
>  Cipher multiple data units =
>  Cipher wrapped key     =
> +Inner checksum         =
> 
>  ;
>  ; Supported crypto algorithms of a default crypto driver.
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index 05fc2fdee7..8308e00ed4 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -232,8 +232,8 @@ Deprecation Notices
>    IPsec payload MSS (Maximum Segment Size), and ESN (Extended Sequence Number).
> 
>  * security: The IPsec SA config options ``struct rte_security_ipsec_sa_options``
> -  will be updated with new fields to support new features like IPsec inner
> -  checksum, TSO in case of protocol offload.
> +  will be updated with new fields to support new features like TSO in case of
> +  protocol offload.
> 
>  * ipsec: The structure ``rte_ipsec_sa_prm`` will be extended with a new field
>    ``hdr_l3_len`` to configure tunnel L3 header length.
> diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
> index 8da851cccc..93d1b36889 100644
> --- a/doc/guides/rel_notes/release_21_11.rst
> +++ b/doc/guides/rel_notes/release_21_11.rst
> @@ -194,6 +194,10 @@ ABI Changes
>    ``rte_security_ipsec_xform`` to allow applications to configure SA soft
>    and hard expiry limits. Limits can be either in number of packets or bytes.
> 
> +* security: The new options ``ip_csum_enable`` and ``l4_csum_enable`` were added
> +  in structure ``rte_security_ipsec_sa_options`` to indicate whether inner
> +  packet IPv4 header checksum and L4 checksum need to be offloaded to
> +  security device.
> 
>  Known Issues
>  ------------
> diff --git a/lib/cryptodev/rte_cryptodev.h b/lib/cryptodev/rte_cryptodev.h
> index bb01f0f195..d9271a6c45 100644
> --- a/lib/cryptodev/rte_cryptodev.h
> +++ b/lib/cryptodev/rte_cryptodev.h
> @@ -479,6 +479,8 @@ rte_cryptodev_asym_get_xform_enum(enum rte_crypto_asym_xform_type *xform_enum,
>  /**< Support operations on multiple data-units message */
>  #define RTE_CRYPTODEV_FF_CIPHER_WRAPPED_KEY		(1ULL << 26)
>  /**< Support wrapped key in cipher xform  */
> +#define RTE_CRYPTODEV_FF_SECURITY_INNER_CSUM		(1ULL << 27)
> +/**< Support inner checksum computation/verification */
> 
>  /**
>   * Get the name of a crypto device feature flag
> diff --git a/lib/security/rte_security.h b/lib/security/rte_security.h
> index ab1a6e1f65..945f45ad76 100644
> --- a/lib/security/rte_security.h
> +++ b/lib/security/rte_security.h
> @@ -230,6 +230,24 @@ struct rte_security_ipsec_sa_options {
>  	 * * 0: Do not match UDP ports
>  	 */
>  	uint32_t udp_ports_verify : 1;
> +
> +	/** Compute/verify inner packet IPv4 header checksum in tunnel mode
> +	 *
> +	 * * 1: For outbound, compute inner packet IPv4 header checksum
> +	 *      before tunnel encapsulation and for inbound, verify after
> +	 *      tunnel decapsulation.
> +	 * * 0: Inner packet IP header checksum is not computed/verified.
> +	 */
> +	uint32_t ip_csum_enable : 1;
> +
> +	/** Compute/verify inner packet L4 checksum in tunnel mode
> +	 *
> +	 * * 1: For outbound, compute inner packet L4 checksum before
> +	 *      tunnel encapsulation and for inbound, verify after
> +	 *      tunnel decapsulation.
> +	 * * 0: Inner packet L4 checksum is not computed/verified.
> +	 */
> +	uint32_t l4_csum_enable : 1;

As I understand these 2 new flags serve two purposes:
1. report HW/PMD ability to perform these offloads.
2. allow user to enable/disable this offload on SA basis.

One question I have - how it will work on data-path?
Would decision to perform these offloads be based on mbuf->ol_flags value
(same as we doing for ethdev TX offloads)?
Or some other approach is implied?

>  };
> 
>  /** IPSec security association direction */
> --
> 2.22.0